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drm/i915: Split intel_ring_begin

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In preparation for handling ring seqno wrapping, split
intel_ring_begin into helper part which doesn't allocate
seqno.

Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Mika Kuoppala 2012-12-04 15:12:03 +02:00 committed by Daniel Vetter
parent 43a7b924a9
commit cbcc80dff3
1 changed files with 22 additions and 15 deletions
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37
drivers/gpu/drm/i915/intel_ringbuffer.c
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@ -1363,11 +1363,31 @@ intel_ring_alloc_seqno(struct intel_ring_buffer *ring)
return i915_gem_get_seqno(ring->dev, &ring->outstanding_lazy_request);
}
static int __intel_ring_begin(struct intel_ring_buffer *ring,
int bytes)
{
int ret;
if (unlikely(ring->tail + bytes > ring->effective_size)) {
ret = intel_wrap_ring_buffer(ring);
if (unlikely(ret))
return ret;
}
if (unlikely(ring->space < bytes)) {
ret = ring_wait_for_space(ring, bytes);
if (unlikely(ret))
return ret;
}
ring->space -= bytes;
return 0;
}
int intel_ring_begin(struct intel_ring_buffer *ring,
int num_dwords)
{
drm_i915_private_t *dev_priv = ring->dev->dev_private;
int n = 4*num_dwords;
int ret;
ret = i915_gem_check_wedge(dev_priv, dev_priv->mm.interruptible);
@ -1379,20 +1399,7 @@ int intel_ring_begin(struct intel_ring_buffer *ring,
if (ret)
return ret;
if (unlikely(ring->tail + n > ring->effective_size)) {
ret = intel_wrap_ring_buffer(ring);
if (unlikely(ret))
return ret;
}
if (unlikely(ring->space < n)) {
ret = ring_wait_for_space(ring, n);
if (unlikely(ret))
return ret;
}
ring->space -= n;
return 0;
return __intel_ring_begin(ring, num_dwords * sizeof(uint32_t));
}
void intel_ring_advance(struct intel_ring_buffer *ring)